import Axios, { type AxiosInstance, type AxiosRequestConfig, type CustomParamsSerializer } from "axios";
import type { PureHttpError, RequestMethods, PureHttpResponse, PureHttpRequestConfig } from "./types.d";
import { stringify } from "qs";
import NProgress from "../progress";
import { getToken, formatToken } from "@/utils/auth";
import { useUserStoreHook } from "@/store/modules/user";

// 相关配置请参考：www.axios-js.com/zh-cn/docs/#axios-request-config-1
const defaultConfig: AxiosRequestConfig = {
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: import.meta.env.VITE_APP_BASE_API,
  // 请求超时时间
  timeout: 10000,
  headers: {
    Accept: "application/json, text/plain, */*",
    "Content-Type": "application/json",
    "X-Requested-With": "XMLHttpRequest"
  },
  // 数组格式参数序列化（https://github.com/axios/axios/issues/5142）
  paramsSerializer: {
    serialize: stringify as unknown as CustomParamsSerializer
  }
};

class PureHttp {
  constructor() {
    this.httpInterceptorsRequest();
    this.httpInterceptorsResponse();
  }

  /** `token`过期后，暂存待执行的请求 */
  private static requests = [];

  /** 防止重复刷新`token` */
  private static isRefreshing = false;

  /** 初始化配置对象 */
  private static initConfig: PureHttpRequestConfig = {};

  /** 保存当前`Axios`实例对象 */
  private static axiosInstance: AxiosInstance = Axios.create(defaultConfig);

  /** 重连原始请求 */
  private static retryOriginalRequest(config: PureHttpRequestConfig) {
    return new Promise(resolve => {
      PureHttp.requests.push((token: string) => {
        config.headers["Authorization"] = formatToken(token);
        resolve(config);
      });
    });
  }

  /** 请求拦截 */
  private httpInterceptorsRequest(): void {
    PureHttp.axiosInstance.interceptors.request.use(
      async (config: PureHttpRequestConfig): Promise<any> => {
        // 是否需要设置 token
        //const isToken = (config.headers || {}).isToken === false

        // 是否需要防止数据重复提交
        // const isRepeatSubmit = (config.headers || {}).repeatSubmit === false
        // if (getToken() && !isToken) {
        //   config.headers['Authorization'] = 'Bearer ' + getToken() // 让每个请求携带自定义token 请根据实际情况自行修改
        // }
        // // get请求映射params参数
        // if (config.method === 'get' && config.params) {
        //   let url = config.url + '?' + tansParams(config.params)
        //   url = url.slice(0, -1)
        //   config.params = {}
        //   config.url = url
        // }
        // 开启进度条动画
        NProgress.start();
        // 优先判断post/get等方法是否传入回调，否则执行初始化设置等回调
        if (typeof config.beforeRequestCallback === "function") {
          config.beforeRequestCallback(config);
          return config;
        }
        if (PureHttp.initConfig.beforeRequestCallback) {
          PureHttp.initConfig.beforeRequestCallback(config);
          return config;
        }
        /** 请求白名单，放置一些不需要`token`的接口（通过设置请求白名单，防止`token`过期后再请求造成的死循环问题） */
        const whiteList = ["/refresh-token", "/login"];
        return whiteList.some(url => config.url.endsWith(url))
          ? config
          : new Promise(resolve => {
              const data = getToken();
              if (data) {
                const now = new Date().getTime();
                const expired = parseInt(data.expires) - now <= 0;
                if (expired) {
                  if (!PureHttp.isRefreshing) {
                    PureHttp.isRefreshing = true;
                    // token过期刷新
                    useUserStoreHook()
                      .handRefreshToken({ refreshToken: data.refreshToken })
                      .then(res => {
                        const token = res.data.accessToken;
                        config.headers["Authorization"] = formatToken(token);
                        PureHttp.requests.forEach(cb => cb(token));
                        PureHttp.requests = [];
                      })
                      .finally(() => {
                        PureHttp.isRefreshing = false;
                      });
                  }
                  resolve(PureHttp.retryOriginalRequest(config));
                } else {
                  config.headers["Authorization"] = formatToken(
                    data.accessToken
                  );
                  resolve(config);
                }
              } else {
                resolve(config);
              }
            });
      },
      error => {
        return Promise.reject(error);
      }
    );
  }

  /** 响应拦截 */
  private httpInterceptorsResponse(): void {
    const instance = PureHttp.axiosInstance;
    instance.interceptors.response.use(
      (response: PureHttpResponse) => {
        // 未设置状态码则默认成功状态
        // const code = res.data.code || 200
        // // 获取错误信息
        // const msg = errorCode[code] || res.data.msg || errorCode['default']
        // // 二进制数据则直接返回
        // if (res.request.responseType ===  'blob' || res.request.responseType ===  'arraybuffer') {
        //   return res.data
        // }

        // if (code === 401) {
        //   if (!isRelogin.show) {
        //     isRelogin.show = true
        //     ElMessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', { confirmButtonText: '重新登录', cancelButtonText: '取消', type: 'warning' }).then(() => {
        //       isRelogin.show = false
        //       useUserStore().logOut().then(() => {
        //         location.href = '/index'
        //       })
        //     }).catch(() => {
        //       isRelogin.show = false
        //     })
        //   }
        //   return Promise.reject('无效的会话，或者会话已过期，请重新登录。')
        // } else if (code === 500) {
        //   ElMessage({ message: msg, type: 'error' })
        //   return Promise.reject(new Error(msg))
        // } else if (code === 601) {
        //   ElMessage({ message: msg, type: 'warning' })
        //   return Promise.reject(new Error(msg))
        // } else if (code !== 200) {
        //   ElNotification.error({ title: msg })
        //   return Promise.reject('error')
        // } else {
        //   return  Promise.resolve(res.data)
        // }
        const $config = response.config;
        // 关闭进度条动画
        NProgress.done();
        // 优先判断post/get等方法是否传入回调，否则执行初始化设置等回调
        if (typeof $config.beforeResponseCallback === "function") {
          $config.beforeResponseCallback(response);
          return response.data;
        }
        if (PureHttp.initConfig.beforeResponseCallback) {
          PureHttp.initConfig.beforeResponseCallback(response);
          return response.data;
        }
        return response.data;
      },
      (error: PureHttpError) => {
        const $error = error;
        $error.isCancelRequest = Axios.isCancel($error);
        // 关闭进度条动画
        NProgress.done();

        // console.log('err' + error)
        // let { message } = error
        // if (message == "Network Error") {
        //   message = "后端接口连接异常"
        // } else if (message.includes("timeout")) {
        //   message = "系统接口请求超时"
        // } else if (message.includes("Request failed with status code")) {
        //   message = "系统接口" + message.substr(message.length - 3) + "异常"
        // }
        // ElMessage({ message: message, type: 'error', duration: 5 * 1000 })
        // 所有的响应异常 区分来源为取消请求/非取消请求
        return Promise.reject($error);
      }
    );
  }

  /** 通用请求工具函数 */
  public request<T>(
    method: RequestMethods,
    url: string,
    param?: AxiosRequestConfig,
    axiosConfig?: PureHttpRequestConfig
  ): Promise<T> {
    const config = {
      method,
      url,
      ...param,
      ...axiosConfig
    } as PureHttpRequestConfig;

    // 单独处理自定义请求/响应回调
    return new Promise((resolve, reject) => {
      PureHttp.axiosInstance
        .request(config)
        .then((response: undefined) => {
          resolve(response);
        })
        .catch(error => {
          reject(error);
        });
    });
  }

  /** 单独抽离的`post`工具函数 */
  public post<T, P>(
    url: string,
    params?: AxiosRequestConfig<P>,
    config?: PureHttpRequestConfig
  ): Promise<T> {
    return this.request<T>("post", url, params, config);
  }

  /** 单独抽离的`get`工具函数 */
  public get<T, P>(
    url: string,
    params?: AxiosRequestConfig<P>,
    config?: PureHttpRequestConfig
  ): Promise<T> {
    return this.request<T>("get", url, params, config);
  }
}

export const http = new PureHttp();
